[PATCH] D59884: [mips] Fix lowering a signed immediate for *.d MSA instructions

[Simon Atanasyan via Phabricator via llvm-commits]

atanasyan created this revision.
atanasyan added a reviewer: Petar.Avramovic.
Herald added subscribers: jrtc27, hiraditya, arichardson, sdardis.
Herald added a project: LLVM.

The `lowerMSASplatImm` function zero-extends `i32` immediates while building constant. If target type is `i64`, negative immediate loses the sign. As a result, for example `__builtin_msa_ldi_d(-1)` lowered to series of instruction loads incorrect value 0xffffffff to the `$w0` register instead of single `ldi.d $w0, -1` instruction.

The fix zero-extends unsigned immediates and signed-extend signed immediates.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D59884

Files:
  llvm/lib/Target/Mips/MipsSEISelLowering.cpp
  llvm/test/CodeGen/Mips/msa/i10.ll
  llvm/test/CodeGen/Mips/msa/i5-c.ll
  llvm/test/CodeGen/Mips/msa/i5-m.ll

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